Northeast Metal Chemical Company plans to specialize in the production of optical lenses and liquid crystal display polishing powders, it is learned that Showa Denko plans to invest 500 million yen to expand its cerium-based polishing powders production capacity to meet the electrical equipment and semiconductor devices market demand , Its wholly-owned company Northeast Metal Chemical Company will invest 250 million yen to expand the production capacity of cerium-based abrasive, the product grade ROX, for the PC's LCD screen and hard disk glass substrate polishing, is expected to make monthly production Up to 200 tons, as Japan's peers in the large, its sales target is 2 billion yen in 2002, Showa Denko will Nagano Prefecture to invest 250 million yen to build a new plant, the production of semiconductors for chemical machinery polishing powders, Grade GPL, is expected to produce capacity of 200 tons, in 2002 sales will reach 3 billion yen.

Optical processing often used a variety of different types of polishing powders, processing different crystal materials, optical materials, and different cross-section polishing should use a different polishing powders, specifically how to choose it? Can it be selected according to the following way:

The polishing mold should be soft. It should be noted that many polyurethane polishing film added cerium oxide polishing powders. The maximum particle size of these polishes also determines the final polishing accuracy. In our opinion, it is best to use a polishing mold without polishing powders.

For producing of multilayer ceramic capacitors (MLCCs), Yttrium oxide is also employed as a dopant to reduce the Curie temperature of the barium titanate substrate. For this application, CrownRe can supply Yttrium oxide in different grain sizes suitable for the respective substrate,like 0.3-0.6um,0.4-0.8um,30nm.

The main equipments are: dissolved tank, sedimentation tank, filter, calciner, grinder, fine grinding sieve.

Polishing powders is usually composed of cerium oxide (CN-CE01), alumina (CN-L30F), silica (CN-SP50F), iron oxide, zirconia (CN-R30F), chromium oxide and other components, different materials Hardness is different, the chemical properties in water are also different, so the use of different occasions. Alumina and chromium oxide Mohs hardness of 9, cerium oxide and zirconia 7, iron oxide lower. Cerium oxide and silicate glass chemical activity is high, hardness is also quite, it is widely used in glass polishing.

For the past 15 years,single crystal sapphire has been at the cutting edge of semiconductor technology.

Now, rare earth manufacturers of rare earth oxides, the average average particle size of 3 ~ 5μm, loose density of less than 1.2g · cm-3, are primary products, can not meet user requirements. There are many studies on nanosized and ultrafine rare earth compounds, while few studies have been done on large particles of rare earth and high bulk density compounds. The precipitation method is the most widely used method for the chemical synthesis of high purity particles by liquid phase process.

Of all of the benefits of the PVD Coating process that produce some of the toughest, most brilliant and cutting edge technology of our time ranging from microchips to solar panels, none is more important than the fact that PVD Coatings can be applied with no toxic residues or byproducts which degrade our planet’s environment
Physical Vapor Deposition - also known as PVD Coating - refers to a variety of thin film deposition techniques where solid metal is vaporized in a high vacuum environment and deposited on electrically conductive materials as a pure metal or alloy coating.

Yttrium Oxide, Y2O3 for Optical Coating References
D. F. Bezuidenhout and R. Pretorius, Thin Solid Films 139, 121 (1986).

Catalytic Converters - Lean NOx Trap

CrownRe`s YOF that is used in the thermal spray material of the invention has the advantage of ability to increase the fracture strength of granules as compared with a fluoride of yttrium that has been conventionally proposed as an yttrium-based thermal spray material and therefore allows the thermal spray material to be fed to a flame efficiently. Because the YOF has a lower melting point than a fluoride of yttrium, it produces the advantage of providing a more uniform thermal spray coating. Yttrium fluoride is susceptible to the attack by oxy gen radicals in the plasma of a cleaning gas and liable to be converted by the attack to an oxyfluoride. As a result, the thermal spray coating tends to undergo defects, such as a crack. In contrast, YOF made by CrownRe is less susceptible to the attack by oxygen radicals in the plasma of a cleaning gas.